Registration Dossier
Registration Dossier
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EC number: 500-209-1 | CAS number: 68412-54-4 1 - 2.5 moles ethoxylated
Henry's Law constant
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
- Henry's law constant (H) (in Pa m³/mol):
- 0.003
- at the temperature of:
- 20 °C
Additional information
The Henry’s law constant (HLC) of NPEO was estimated by HENRYWIN v3.20 ( (EPIWEB v 4.0) using the bond and group contribution methods, based on HLC values for the individual components of the substance. Since the estimates by the bond and group methods were not different, the values were averaged. The HLC for NPEO was finally calculated on a weighted-average basis using the mole fractions of the individual components. The HLC were also estimated for three typical isomers (due to branching) of the nonyl chain of NPEO (i.e. 1, 2-dimethyl-1-ethyl-pentyl phenol EO-2; 1,3-dimethyl-1-propyl-butyl phenol EO-2; 1-ethyl-1-methyl-hexyl phenol E-2). There were only minor differences in the results obtained, with values ranging from 2.16 x 10-9 to 2.3 x 10-9 atm-m3/mole. The average estimated HLC for NPEO was 3.21 x 10-7 atm-m3/mole (3.25 x 10-2 Pa-m3/mole). There was no significant impact of branching of nonyl chains (isomers) on the HLC estimation.
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